This is something I wondered too. I just started tying, and it got awfully confusing dealing with something as simple as streamer hooks. Down eye, straight, up turned.....it had me scratching my head wondering what the big difference between each type really was.

To be honest use basic hooks when you first start tying, look at the selection from Allen fly fishing they look good to me , simple Dry , Nymph , Wet.... get use to tying then shop around for hooks that you want for your patterns.

as in time you will find better threads, furs , feathers , capes and dubbing , its a great pastime if you enjoy it.